ngram analyzer ignores "minsize" during queries

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Issue #471 new
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ngram analyzer only uses the "maxsize" character ngrams during queries. This prevents one of the more common uses of ngrams: spelling robustness.

Example: Here only 6-grams are used, even though the analyzer should detect matches with 3-gram, 4-grams, and 5-grams

text_analyzer = NgramTokenizer(3,6)
schema = Schema(content=TEXT(stored=True, analyzer=text_analyzer, multitoken_query="or"))
query = QueryParser("content", schema).parse("apples")

This prints content:apples, which will not match a document containing appled even though it shares many of the ngrams with sizes 3 and 4. The following ngrams are missing from the query:

'app',  'appl, 'apple', 'ppl', 'pple', 'ple'

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